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The results of the field and in-lab infiltration tests indicate that the sand layer set up in the loess can be characterized not only by better water resistance but also by better infiltration reduction. When the wetting front reaches the interface of the loess layer and sand layer, the non-linear process of infiltration is converted into the linear process, Whereby making the whole infiltration process enter into the steady infiltration stage with a smaller infiltration rate. And at the same time, the finger flow phenomena occurs within sand layer. The research results have been successfully used in the loess residential cave-dwelling houses in Shaanxi province, China, as an important technology of infiltration-proof and collapse-proof engineering during the rainy seasons in a year.